Fountain pen



l portion I having a bore in which is snugly iitted `a hollow body 2having a writing tube 3 at its on its outer end a cleaning needle 4' inthe writ- Patented May 28, 1946 2,401,167 FoUN'rAm PEN Theodor Kovcs,Vienna 117, Germany; vested in the Alien `Property Custodian lApplication November 29, 1941, Serial No. 421,062

In Germany March 12, 1940 3 Claims. (Cl. 1Z0-50) This invention relatesto a fountain pen provided with an annular compensation chamber arrangedin the bore of the neck portion of the pen. In the prior art thischamber has usually been provided by a bodyl inserted into the bore ofthe neck portion, which body has a diameter about l mm. less than thediameter of the bore so that an annular chamber is provided between theinner wall of the neck portion and the outer surface of the body, whichchamber extends to the lower end of the neck portion where it is open tothe atmosphere, and communicates at 'its upper end with the inkreceptacle ofthe pen.

The object of the present invention is to provide a structure in whichthis compensation chamber becomes uniformly filled, and to preventaccidental escape of the ink from the pen. These desirable results aresecured by sub-dividing the compensation chamber by a pair of helicalribs t form a pair of helical channels connected at their upper endswith the ink receptacle and having their lower ends open to theatmosphere. The ribs may be provided on the inner wall of the neckportion, or on the outer surface of the inserted body, or they may beforxnedindependently of both the neck portion and the body, and insertedtherebetween. Providing these' ribs on the inner wall of the neckportion, as shown in the accompanying drawing, is the preferredarrangement, since in this manner any communication between the twochannels is most effectively prevented.

A pen embodying the invention is shown in the accompanying drawing whichis a vertical section of the lower part of a fountain pen.

As illustrated in the drawing, there is a neck outer end which projectsfrom the neck portion I. In the body 2 there is a plunger l having ingtube 3. The inner wall of the neck portion I is provided with two narrowhelical ribs 5, 5'

which closely surround the body 2 and divide the compensation chamberbetween the portion I and the body 2 into two helical channels 6, 6'which communicate at their inner ends with the interior of the body 2through orifices l, l', respectively, which thereby connect thesechannels 6, B' with the ink receptacle 8 of the pen, through the hollowbody 2.- 'I'he outer ends of the chan` nels 6, 6' open to theatmosphere, and increase in depth from their inner ends to their outwardends. al

Ink escaping from the ink receptacle 8 through the oriiices 1, 'I' flowsinto channels 6, 8', and is |55` uniformly conducted away from thesechannels,

during use of the pen. The ribs E, 5' prevent the in'k from escapingfrom the compensation chamber.

What is claimed is:

1. In a fountain pen,` the combination of a body provided with an inkreceptacle; a tubular mem- .ber removably mounted in said body andhaving its inner end communicating with said receptacle; two helicalribs of similar pitch spacing the said member from the body to form apair of helical channels between the body and the member, said channelscommunicating with the atmosphere at the outer end of the body, saidmember being provided at diametrically opposite points with a pair ofapertures, each `of which connects one of said channels with theinterior of the member at its inner end; and a writing tube on the outerend of said member and con nected with the interior thereof.

2. In a fountain pen, the combination of a body having a longitudinalbore and provided with a plurality of helical ribs in said bore; atubular member disposed in said bore and forming with said ribs aplurality of channels between said body and said member, said channelscommunicating with the atmosphere at the outer end of the bore, saidmember having a plurality of apertures adjacent the inner end of thebore, each of which connects one of said channels with the interior ofthe tubular member; an ink receptacle in said body and communicatingwith the inner end of the said member; and a writing tube on the outerend of the member and connected with the interior thereof.

3. In a fountain pen, the'combination of a body provided with an inkreceptacle, and having a longitudinal bore extending from one end of thebody to and connected with the receptacle; a plurality of helical ribson the body in said bore producing a plurality of helical channels, saidchannels communicating with the atmosphere at the outer end of the bore;a tubular member inserted in said body in snug engagement with the outeredges of said ribs, and removably connected at the inner end ofsaidmember with said body, its said inner end communicating with said inkreceptacle, and being provided with a plurality of orices, each of saidorifices connecting the interior of the tubular member with one of` saidhelical channels at the end of the channel toward the inner end of thebore; and a writing tube on the outer end of said tubular member andconnected with the interior of said member.

THEoDoR KovAcs.

